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             <h1 id="&#x56DE;&#x8C03;&#x51FD;&#x6570;">&#x56DE;&#x8C03;&#x51FD;&#x6570;</h1>
<p>&#x548C;&#x4EE5;&#x5F80;&#x63A5;&#x89E6;&#x5230;&#x7684;&#x4E2D;&#x65AD;&#x670D;&#x52A1;&#x51FD;&#x6570;&#x4E0D;&#x540C;&#x7684;&#x662F;&#xFF0C;HAL&#x5E93;&#x4E0B;&#x7684;&#x4E2D;&#x65AD;&#x5904;&#x7406;&#x5E76;&#x4E0D;&#x662F;&#x76F4;&#x63A5;&#x8FDB;&#x5165;&#x4E2D;&#x65AD;&#x670D;&#x52A1;&#x7A0B;&#x5E8F;&#x5E76;&#x5728;&#x5176;&#x4E2D;&#x8FDB;&#x884C;&#x76F8;&#x5E94;&#x4E2D;&#x65AD;&#x5904;&#x7406;&#xFF0C;&#x800C;&#x662F;<strong>&#x8FDB;&#x5165;&#x4E2D;&#x65AD;&#x670D;&#x52A1;&#x7A0B;&#x5E8F;&#x540E;&#xFF0C;&#x6E05;&#x9664;&#x76F8;&#x5E94;&#x6807;&#x5FD7;&#x4F4D;&#xFF0C;&#x8FDB;&#x5165;&#x56DE;&#x8C03;&#x51FD;&#x6570;&#x4E2D;&#x5904;&#x7406;</strong></p>
<p>&#x5982;&#x5728;<code>stm32f4xx_it.c</code>&#x8DF3;&#x8F6C;&#x5230;<code>HAL_GPIO_EXTI_IRQHandler(GPIO_PIN_0)</code>&#x4E2D;&#x6709;&#xFF1A;</p>
<pre><code class="lang-c"><span class="hljs-function"><span class="hljs-keyword">void</span> <span class="hljs-title">HAL_GPIO_EXTI_IRQHandler</span><span class="hljs-params">(uint16_t GPIO_Pin)</span>
</span>{
  <span class="hljs-comment">/* EXTI line interrupt detected */</span>
  <span class="hljs-keyword">if</span>(__HAL_GPIO_EXTI_GET_IT(GPIO_Pin) != RESET)
  {
    __HAL_GPIO_EXTI_CLEAR_IT(GPIO_Pin);
    HAL_GPIO_EXTI_Callback(GPIO_Pin);
  }
}
</code></pre>
<p>&#x4EE5;&#x4E0A;&#x662F;HAL&#x4E2D;&#x7684;&#x4E2D;&#x65AD;&#x670D;&#x52A1;&#x7A0B;&#x5E8F;&#xFF0C;&#x53EF;&#x4EE5;&#x770B;&#x51FA;&#x5728;<code>__HAL_GPIO_EXTI_CLEAR_IT()</code>&#x6E05;&#x9664;&#x76F8;&#x5E94;&#x6807;&#x5FD7;&#x4F4D;&#x540E;&#xFF0C;&#x7A0B;&#x5E8F;&#x8FDB;&#x5165;&#x4E86;&#x4E00;&#x4E2A;&#x53EB;&#x505A;<code>HAL_GPIO_EXTI_Callback()</code>&#x7684;&#x56DE;&#x8C03;&#x51FD;&#x6570;&#xFF0C;&#x5E76;&#x4F20;&#x5165;&#x4E86;&#x4E00;&#x4E2A;&#x89E6;&#x53D1;&#x7684;&#x5F15;&#x811A;<code>(GPIO_Pin)</code></p>
<h1 id="&#x7528;&#x6237;&#x7684;&#x4E2D;&#x65AD;&#x670D;&#x52A1;&#x7A0B;&#x5E8F;">&#x7528;&#x6237;&#x7684;&#x4E2D;&#x65AD;&#x670D;&#x52A1;&#x7A0B;&#x5E8F;</h1>
<p>HAL&#x5E93;&#x4E2D;&#x6240;&#x9700;&#x8981;&#x7528;&#x5230;&#x7684;&#x4E2D;&#x65AD;&#x56DE;&#x8C03;&#x51FD;&#x6570;&#x90FD;&#x662F;&#x5F31;&#x5B9A;&#x4E49;&#xFF0C;&#x683C;&#x5F0F;&#x4E3A;<code>HAL_(&#x4E2D;&#x65AD;&#x7684;&#x5916;&#x8BBE;)_Callback(&#x7528;&#x4E8E;&#x533A;&#x5206;&#x7684;&#x53C2;&#x6570;)</code>&#x6211;&#x4EEC;&#x53EF;&#x4EE5;&#x5728;&#x522B;&#x7684;&#x5730;&#x65B9;&#x518D;&#x6B21;&#x58F0;&#x660E;&#xFF0C;&#x6DFB;&#x52A0;&#x81EA;&#x5DF1;&#x7684;&#x4EE3;&#x7801;&#xFF0C;&#x5982;&#x5728;<code>main.c</code>&#x4E0B;&#x65B9;&#x6211;&#x4EEC;&#x53EF;&#x4EE5;&#x6DFB;&#x52A0;&#x5982;&#x4E0B;&#x7A0B;&#x5E8F;&#xFF0C;&#x5B9E;&#x73B0;&#x6309;&#x952E;&#x5207;&#x6362;&#x706F;&#x7684;&#x95EA;&#x70C1;&#x72B6;&#x6001;&#xFF1A;</p>
<pre><code class="lang-c"><span class="hljs-comment">/* USER CODE BEGIN 4 */</span>
<span class="hljs-function"><span class="hljs-keyword">void</span> <span class="hljs-title">HAL_GPIO_EXTI_Callback</span><span class="hljs-params">(uint16_t GPIO_Pin)</span>
</span>{
  <span class="hljs-keyword">static</span> <span class="hljs-keyword">uint8_t</span> tick = <span class="hljs-number">0</span>;
  <span class="hljs-keyword">if</span> (GPIO_Pin == KEY_Pin)
  {
    tick = !tick;
    <span class="hljs-keyword">if</span> (tick)
      LedStates = <span class="hljs-number">0xAA</span>;
    <span class="hljs-keyword">else</span>
      LedStates = <span class="hljs-number">0x0F</span>;
  }
}
<span class="hljs-comment">/* USER CODE END 4 */</span>
</code></pre>
<p>&#x4E3B;&#x7A0B;&#x5E8F;&#x4FDD;&#x6301;&#x548C;&#x4EE5;&#x5F80;&#x8BFE;&#x7A0B;&#x4E00;&#x6837;&#x5373;&#x53EF;&#xFF1A;</p>
<pre><code class="lang-c"><span class="hljs-keyword">while</span> (<span class="hljs-number">1</span>)
{
  Led_Tick();
  HAL_Delay(<span class="hljs-number">5</span>);
  <span class="hljs-comment">/* USER CODE END WHILE */</span>

  <span class="hljs-comment">/* USER CODE BEGIN 3 */</span>
}
</code></pre>
<h1 id="&#x5E94;&#x7528;&#x62D3;&#x5C55;">&#x5E94;&#x7528;&#x62D3;&#x5C55;</h1>
<p>&#x73B0;&#x5728;&#x6240;&#x914D;&#x7F6E;&#x7684;&#x662F;&#x6309;&#x4E0B;&#x6309;&#x952E;&#x89E6;&#x53D1;&#x7684;&#x4E2D;&#x65AD;&#xFF0C;&#x90A3;&#x4E48;&#x8BE5;&#x5982;&#x4F55;&#x914D;&#x7F6E;&#x4F7F;&#x5176;&#x7F16;&#x7A0B;&#x677E;&#x624B;&#x89E6;&#x53D1;&#x7684;&#x4E2D;&#x65AD;&#xFF1F;&#x591A;&#x4E2A;&#x5916;&#x90E8;&#x4E2D;&#x65AD;&#x662F;&#x5426;&#x516C;&#x7528;&#x4E00;&#x4E2A;&#x56DE;&#x8C03;&#x51FD;&#x6570;&#xFF1F;</p>
 
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